1 files changed, 62 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm
new file mode 100644
index 00000000..f67fd178
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm
@@ -0,0 +1,62 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   ZeroMem.nasm
+;
+; Abstract:
+;
+;   ZeroMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  EFIAPI
+;  InternalMemZeroMem (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count
+;    );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+    push    edi
+    mov     edi, [esp + 8]
+    mov     edx, [esp + 12]
+    xor     ecx, ecx
+    sub     ecx, edi
+    xor     eax, eax
+    and     ecx, 63
+    jz      .0
+    cmp     ecx, edx
+    cmova   ecx, edx
+    sub     edx, ecx
+    rep     stosb
+.0:
+    mov     ecx, edx
+    and     edx, 63
+    shr     ecx, 6
+    jz      @ZeroBytes
+    pxor    xmm0, xmm0
+.1:
+    movntdq [edi], xmm0
+    movntdq [edi + 16], xmm0
+    movntdq [edi + 32], xmm0
+    movntdq [edi + 48], xmm0
+    add     edi, 64
+    loop    .1
+    mfence
+@ZeroBytes:
+    mov     ecx, edx
+    rep     stosb
+    mov     eax, [esp + 8]
+    pop     edi
+    ret
+